I just started using DirectDraw 7, and I created my game in fullscreen. I am trying to give it a window mode as well, but it keeps crashing when I call GetDC(). I basically used the example from the switcher program in the SDK for window mode. I even compiled the switcher program and it too crashes during GetDC when in Window Mode. Fullscreen is fine for my game and the switcher game. Does anyone know what I am doing wrong? I can show how I am initializing DirectDraw if it is needed. But it is identical to switcher and that runs fine if I use the EXE in the samples. Just doesn''t if I compile the source in examples. thanks

Thanks for replying...but I am locking the back buffer.
So does the switcher program in the SDK. I forgot to mention
that Lock crashes the program also in Window mode.

Here is how I initialize DirectDraw in Window Mode:



// Get normal windowed mode
hRet = DirectDrawCreateEx(NULL, (VOID**)&g_pDD, IID_IDirectDraw7, NULL);
if (hRet != DD_OK)
return InitFail(hWndmain, hRet, "DirectDrawCreateEx FAILED");
hRet = g_pDD->SetCooperativeLevel(hWnd, DDSCL_NORMAL);
if (hRet != DD_OK)
return InitFail(hWnd, hRet, "SetCooperativeLevel FAILED");

// Get the dimensions of the viewport and screen bounds
GetClientRect(hWnd, &g_rcViewport);
GetClientRect(hWnd, &g_rcScreen);
ClientToScreen(hWnd, (POINT*)&g_rcScreen.left);
ClientToScreen(hWnd, (POINT*)&g_rcScreen.right);


// Create the primary surface
ZeroMemory(&ddsd,sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS;
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
hRet = g_pDD->CreateSurface(&ddsd, &g_pDDSPrimary, NULL);
if (hRet != DD_OK)
return InitFail(hWnd, hRet, "CreateSurface FAILED");

// Create a clipper object since this is for a Windowed render
hRet = g_pDD->CreateClipper(0, &pClipper, NULL);
if (hRet != DD_OK)
return InitFail(hWnd, hRet, "CreateClipper FAILED");

// Associate the clipper with the window
hRet = pClipper->SetHWnd(0, hWnd);
if (hRet != DD_OK)
return InitFail(hWnd, hRet, "SetHWnd FAILED");
hRet = g_pDDSPrimary->SetClipper(pClipper);
if (hRet != DD_OK)
return InitFail(hWnd, hRet, "SetClipper FAILED");
pClipper->Release();
pClipper = NULL;

// Get the backbuffer. For fullscreen mode, the backbuffer was created
// along with the primary, but windowed mode still needs to create one.
ddsd.dwFlags = DDSD_WIDTH / DDSD_HEIGHT / DDSD_CAPS;
ddsd.dwWidth = 640;
ddsd.dwHeight = 480;
ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;
hRet = g_pDD->CreateSurface(&ddsd, &g_pDDSBack, NULL);
if (hRet != DD_OK)
return InitFail(hWnd, hRet, "CreateSurface2 FAILED");

/////////////////////////////////////////////////////////

This code crashes the program in Window mode
g_pDDSBack->GetDC( &hdc );